The US and Europe have denounced President Vladimir Putin's first visit to Crimea since Russia took control from Ukraine in March.

As Mr Putin arrived in Sevastopol on Friday to take part in celebrations to mark the Soviet victory over the Nazis in World War Two, there were further deadly clashes in eastern Ukraine.

Speaking at the military parade, Mr Putin said: "I am sure that 2014 will go into the annals of our whole country as the year when the nations living here firmly decided to be together with Russia, affirming fidelity to the historical truth and the memory of our ancestors."

He also told the West to respect Russia's interests, including its right to self-determination.

US State Department spokeswoman Jen Psaki called on Russia to take steps "in accordance with its Geneva commitments" to diffuse escalating tensions in eastern Ukraine.

Mr Putin at the military parade in Crimea

In the southeastern port city of Mariupol, Ukrainian troops used armoured vehicles and large-calibre weapons as they tried to take an occupied police headquarters.

Sky's Katie Stallard, at the scene, said there were reports between 20 and 30 people have been killed, and around 25 injured. But she said it was impossible to verify the numbers.

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Gallery: Victory Day Parade In Moscow

Russian President Vladimir Putin makes a speech before the Victory Day parade in Moscow's Red Square.

Ms Psaki condemned the violence, which she said was "caused by pro-Russia separatists".

"We continue to call for groups who have jeopardised public order by taking up arms and seizing public buildings in violation of Ukrainian law to disarm and leave the buildings they have seized," she added.

Ukraine's foreign ministry said of the visit: "This provocation once again confirms that Russia deliberately seeks further escalation of tensions."